After the crime, the suspect disappeared without a trace.
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history
From the Song-dynasty 《北梦琐言》 by 孙光宪, describing a refugee hiding in remote Sichuan to avoid pursuit — extinguishing his voice and concealing his tracks.
memory
销声 (extinguish sound) + 匿迹 (hide traces) — no sound, no footprints, completely vanished.